Sewer gas may contain which of the following components?

The presence of various gases in sewer systems arises primarily from the decomposition of organic waste. Sewer gas is a mixture that can contain several components, notably hydrogen sulfide (H2S), methane, and carbon dioxide.

Hydrogen sulfide (H2S) is a colorless gas notorious for its rotten egg smell. It is produced during the breakdown of organic matter, especially in environments where oxygen is limited. This gas is hazardous to health, even at low concentrations, leading to symptoms such as headaches or more severe effects at higher levels.

Methane is another significant component of sewer gas. It is produced by anaerobic bacteria during the digestion of organic material in sewage. Methane is flammable and poses explosion risks if accumulated in enclosed spaces.

Carbon dioxide, a common by-product of organic matter breakdown, is also found in sewer gas. While less toxic than the others, elevated levels can displace oxygen and lead to suffocation in poorly ventilated spaces.

Given that all three components—H2S, methane, and carbon dioxide—can be present in sewer gas, the correct answer confirming the inclusion of all these gases is accurate. Each compound contributes to the composition and potential hazards associated with sewer gas, highlighting the importance of proper sewage management and